Hello all,

I would like to know how to have access to edge extremities (x1,y1) and (x2,y2) when we calculate for example:

```
int1d(ThK)(u*((x - x1)*(x2 - x1) + (y - y1)*(y2 - y1))/( (x2 - x1)^2 + (y2 – y1)^2 ))
```

The problem reads how to find the two vertices of the current edge.

Thank you in advance for your help,

Best regards,

Loïc,